关键词: 路噪；压耳；空腔声；传递路径；模态

Abstract: In order to optimize some low-frequency road noise problems of a pure electric sport utility vehicle (SUV), this paper investigates and optimizes the excitation source, transmission path and response of this model in detail through the analysis of road noise transmission path based on the mechanism of road noise generation and combines with the mode distribution of the whole vehicle, and effectively suppresses the vehicle low-frequency road noise. This paper identifies different frequencies of noise in the front and rear of the vehicle, including ear pressure near 30 Hz in the front, cavity sound near 200 Hz in the front, and drumming near 75 Hz in the back. The low frequency noise of the vehicle is controlled to a good level through road noise source control, path vibration isolation improvement and response optimization, and the subjective evaluation is good. The low-frequency road noise problem identified in this paper is a typical problem in the process of vehicle road noise development. The analysis and optimization ideas have certain guiding significance for the analysis, investigation and test methods of vehicle road noise problems.

Key words: Road noise; Press the ear; Cavity sound; Transfer path; Mode